A handwriting instrument with a stamp carrier (40) with stamp pad (41) introduced from the side into the stock (10). The stamp carrier is releasably connected to a lid (20). The lid (20) is a segment of the stock (10). For this writing instrument a flexible standard refill (50) is provided, with which the aide of a guide bar (53) and further stock elements is bent and held against the inner wall of the stock (10) in such a manner, that it's central area is eccentrically displaced for providing greater space for the stamp carrier (40).